You know, most companies make a big deal about it when they offer free stuff that you can use in their games. Games Workshop, on the other hand, does the exact opposite. Despite having scads of cool free downloads on their site, they make it impossible to find. I found the Place that Codex: Catachans was supposed to be listed, it even said so in the page description. Once it loads, it was not there. Aaaah! But then, during a google search, I actually found a link, and wonder of wonder, it was actually still up. So GW removed the link but not the file. I swear, they just delight in website easter eggs. Whatever, at least I found what I was looking for.
I am posting the link here so I can find it if I ever need it again, feel free to use it if you ever run into the same problem! Codex: Catachans